Results 51 to 60 of about 1,082,995 (200)
Ibis, EarlyView.Migratory bird species fascinate humanity but also contribute significantly to the ecosystems they visit in various ways (e.g. food web structures) and can thus be considered good environmental indicators. Although protected areas (PAs) should play an important role in the conservation of migratory species, this is not always achieved; for example ...
Rion E Lerm +3 more
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Journal of Fish Biology, EarlyView.Abstract Suckermouth catfishes of the genus Chiloglanis Peters 1868 are small and predominantly rheophilic fishes endemic to Africa. This genus is quite diverse, with over 70 species distributed across most river systems on the continent, except for the Cape Fold ecoregion and most of northern Africa.
Tadiwa Isaac Mutizwa +2 more
wiley +1 more source
Pseudospectra of the direct sum of linear operators in ultrametric Banach spaces
Қарағанды университетінің хабаршысы. Математика сериясыIn this paper, a characterization of essential pseudospectra of bounded linear operators on ultrametric Banach spaces over a spherically complete field was given and the notions of pseudospectra and condition pseudospectra of the direct sum of linear ...
J. Ettayb
doaj +1 more source
A look at nonexpansive mappings in non-Archimedean vector spaces
Moroccan Journal of Pure and Applied Analysis, 2021 In a spherically complete ultrametric space every nonexpansive self-mapping T has a fixed point ̄x or a minimal invariant ball B(̄x, d(̄x, T(̄x)). We show how we can approximate this fixed center ̄x in a non-Archimedean vector space.
Lazaiz Samih
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Journal of Systematics and Evolution, EarlyView.Divergence times of Greek Hydropsyche lineages fall mostly within the Pliocene‐Pleistocene, rejecting ancient vicariance. Widespread species show shallow divergences consistent with dispersal, while island endemics exhibit deeper isolation patterns supporting a mixed vicariance‐dispersal model.
Anastasia Lampou +5 more
wiley +1 more source
PLANTS, PEOPLE, PLANET, Volume 8, Issue 6, Page 2061-2079, November 2026.Medicinal plants used in ethnobotanical traditions to treat or prevent diseases have gained renewed interest for their largely untapped potential in drug discovery. In this study, we developed and tested novel methods to prioritise plant species based on their unexplored medicinal potential. By enabling researchers to target the most promising species,
Giovanni Zecca +3 more
wiley +1 more source
Ecology and Evolution, Volume 16, Issue 10, October 2026.This study investigated the evolutionary history and population structure of the genus Neaphaenops, using CO1 gene sequencing from 62 cave populations. The phylogenetic analysis revealed two distinct mega‐populations—northern and southern—separated by the Barren River, leading to the conclusion that the four proposed subspecies are invalid. The results
Mahamad Sayab Miya +2 more
wiley +1 more source
Indivisible ultrametric spaces
Topology and its Applications, 2008 A metric space is indivisible if for any partition of it into finitely many pieces one piece contains an isometric copy of the whole space. Continuing our investigation of indivisible metric spaces, we show that a countable ultrametric space embeds isometrically into an indivisible ultrametric metric space if and only if it does not contain a strictly ...
Delhommé, Christian +3 more
openaire +4 more sources
On Quasisymmetric Mappings Between Ultrametric Spaces
p-Adic Numbers, Ultrametric Analysis and Applications, 2021 In 1980 P. Tukia and J. Väisälä in seminal paper [P. Tukia and J. Väisälä, Quasisymmetric embeddings of metric spaces, Ann. Acad. Sci. Fenn., Ser. A I, Math. 5, 97--114 (1980)] extended a concept of quasisymmetric mapping known from the theory of quasiconformal mappings to the case of general metric spaces.
Petrov, Evgeniy, Salimov, Ruslan
openaire +2 more sources